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911pcars 911pcars is offline
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Join Date: Jul 2000
Location: So. Calif.
Posts: 18,191
Sounds like some confusion over cast vs forged.

All formed material begins in a liquid state. Casting is when the liquid material is poured into a shape (permanent mold, sand cast, etc.) then allowed to cool. The part is then machined or used as is.

Forging is when the still hot material is cooled to a semi-plastic state and hammered to shape before cooling to room temp (improves grain structure), then machined. Forming threads by rolling maintains strength. Forming threads by cutting creates stress risers and invites failure for critical fasteners.

Hope this helps,
Sherwood
Old 06-30-2004, 11:34 AM
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